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In the tutorial, the speaker explains how to use droppers to apply urine samples for a pregnancy test. The top dropper contains urine with HCG from the speaker, who is pregnant, while the bottom dropper contains urine from the speaker's husband, which should not have HCG. The procedure involves adding three drops from each dropper to the respective test and waiting three minutes to read the results. It's emphasized not to read the results after five minutes, as they become invalid. After three minutes, both tests show a line in the control areas, indicating that enough urine was added and that the tests are functioning correctly.